CN100431319C

CN100431319C - Communication equipment, address mapping equipment, name analytic equipment, communication method and program

Info

Publication number: CN100431319C
Application number: CNB021463514A
Authority: CN
Inventors: 岩田英希; 栗田敏彦; 岩仓广和; 山岛弘之
Original assignee: Fujitsu Ltd
Current assignee: Fujitsu Ltd
Priority date: 2001-10-24
Filing date: 2002-10-24
Publication date: 2008-11-05
Anticipated expiration: 2022-10-24
Also published as: EP1307029B1; CN1414755A; EP1307029A2; EP1307029A3

Abstract

The invention provides communication equipment, address translation equipment, name resolution equipment, communication method and program which can reduce the use number for assignment temporary addresses, in address translation between address systems different from each other, thus realizing free communication between two networks of large scale which abide by different protocols. A transmission source address or a transmission source port number which corresponds in case that a temporary address is assigned is registered collectively.

Description

Communication equipment, address mapping equipment, name resolving equipment and communication means

Technical field

The present invention relates to communication equipment, communication means and program, particularly employed communication equipment, communication means and in following communication system for making this method carry out the program of using on computers.In order between network, to communicate with different mailing address systems or different mailing address management system, the communication title of communication partner device can be transformed to the name resolving equipment of mailing address except having in each network, in two networks, also have public mailing address conversion equipment.

Background technology

For example, at address system or under the situation of the inter-net communication that always number of addresses is very different, when for example between IPv4 such as internet (Internet Protocol Version 4) net and IPv6 (Internet Protocol Version 6) net, communicating, for example, suppose the situation of communication equipment from IPv4 net (below brief note be " IPv4 communication equipment ") to the communication equipment of IPv6 net (below brief note be " IPv6 communication equipment ") communication.Under this situation shape, wish to have a kind of system, this system's utilization can be transformed to the title of IPv6 net the equipment of address, and the gateway device that can carry out relaying between IPv4 net and IPv6 net (for example, the mailing address conversion equipment), needn't realize the different of address system between them and number of addresses fully, just can between IPv4 communication equipment and IPv6 communication equipment, communicate.

As the communication means between existing communication equipment,, begin communication between communication equipment according to the resulting address of this Query Result then as is generally known its technology is inquired about DNS (domain name system) by the communication equipment that begins to communicate by letter.For example, from the IPv4 communication equipment under the situation of IPv6 communication apparatus communication, the technology that just can adopt the spy to open to be put down in writing in the flat 10-154994 communique (below be designated as " prior art ").

In addition, above-mentioned DNS (Domain Name System) is meant the employed name service of TCP/IP (transmission control protocol/Internet Protocol) network system.In the case, dns server has the correspondence table of host name and IP address, and the user can replace the IP address to receive the notice of IP address according to its host name.In addition, when receiving mail,, just can receive mail as long as recipient's mail server name is signed in in the dns server by the internet.

Fig. 1 is the key diagram of described prior art.According to the prior art, for the communication between the terminal of distributing its address according to different agreement (below be designated as " communication equipment "), needn't carry out big appending to agreement, just can provide the system that can realize address mapping.As shown in Figure 1, from observing IPv4 protocol of I Pv4 communication equipment A when communicating in accordance with IPv6 protocol of I Pv6 communication equipment B, IPv4 communication equipment A is to the address of address mapping equipment 51 inquiry IPv6 communication equipment B.At this moment, address mapping equipment 51 is obtained the network address (IPv6 address) of IPv6 communication equipment B from name server (DNS) 52, will return to IPv4 communication equipment A corresponding to its virtual IP address v4 address then.

Utilize this IPv4 virtual address, IPv4 communication equipment A just can communicate IPv6 communication equipment B.At this moment, router five 3 is obtained the correspondence table of IPv6 address and IPv4 virtual address from address mapping equipment, according to this correspondence table, is being that B communicates with communication equipment on the basis of IPv6 address with the IPv4 virtual address translation.

That is to say that to above-mentioned address mapping system, address mapping equipment 51 is to IPv4 communication equipment A notice IPv4 virtual address, IPv4 communication equipment A begins to communicate according to this IPv4 virtual address.Between IPv4 net and IPv6 net, carry out the router (routing device) 53 of relaying, after having received the communication of sending and beginning request, the equipment that the name of IPv6 communication equipment B is transformed to the address is inquired about from IPv4 communication equipment A.Then, obtain,, can obtain IPv6 address from the IPv4 virtual address of communication counterpart as actual address according to this correspondence table as the IPv6 address of the actual address of communication counterpart and the correspondence table between the IPv4 virtual address.So, begin request, thereby make communicating by letter between IPv4 communication equipment A and IPv6 communication equipment B become possibility to IPv6 communication equipment trunking traffic.

In addition, as is generally known above-mentioned IP v6 is the communications protocol of future generation that replaces the Internet communication protocol IPv4 of present standard.It is the communication protocol with the existing various problems of address space that solve existing internet (deficiency of CLASS B, the deficiency of saturated, 32 bit address of route control information etc.).

But but there is following problem in such method.That is to say, in this way, owing to just try to achieve the IPv6 destination address from the IPv4 virtual address, when sending to a plurality of communication equipments under the situation of communication request from a plurality of IPv4 equipment simultaneously, IPv4 virtual address number just must have at least the number of IPv6 destination address so much.

Especially, compare total number of addresses of IPv4 net and total number of addresses of IPv6 net, as is generally known total number of addresses of IPv4 net is less than total number of addresses of IPv6 net far away.Therefore, when consider to carry out under the situation of relaying between large-scale IPv4 net and IPv6 net, the IPv4 virtual address just may be not enough.Its possibility of result can cause and can not communicate by letter.

In view of above-mentioned problem, the objective of the invention is to, when from the communication equipment of a network when the communication equipment of another network communicates, the name resolving equipment that the title of the communication equipment of another network is transformed to the address can reduce destination address (virtual address) number of the transmit leg that is distributed effectively, thereby can realize two large-scale internetwork free communications.

Summary of the invention

For addressing the above problem, the present invention has when communicating between a plurality of communication networks of different address systems, when the address mapping that carries out between different address systems, the terminal address of a corresponding communication network or the application program identification of regulation are logined simultaneously.Its result, even under the virtual address sum situation of when address mapping, selecting seldom corresponding to the address of different address systems, by the application program identification of the terminal address of above-mentioned counterparty's communication network or regulation is combined, each virtual address just can be repeated to use.Consequently, for example when the IPv4 communication network is communicated by letter to the IPv6 communication network, just can cut down the required allotment of virtual address of IPv4 address system effectively.

Description of drawings

Fig. 1 is the key diagram of the problem points that communicates between existing different address system.

Fig. 2 is the key diagram according to the communication system of the 1st embodiment of the present invention.

Fig. 3 is the structure chart of the IPv4 communication equipment among Fig. 2.

Fig. 4 is the structure chart of the name resolving equipment among Fig. 2.

Fig. 5 is the structure chart of the mailing address conversion equipment among Fig. 2.

Fig. 6 is the key diagram (its 1) of used list data in the 1st embodiment of the present invention, and A represents information source port numbers table, and B represents the IPv4 virtual address table.

Fig. 7 is the key diagram (its 2) of used list data in the 1st embodiment of the present invention, and A represents the map information table by the IPv4 source address, and B represents the map information table by the information source port numbers.

Fig. 8 is the key diagram of the 1st communication means in the 1st embodiment of the present invention.

Fig. 9 is the method schematic diagram of deleting in the 1st embodiment of the present invention by the map information table of IPv4 source address.

Figure 10 is the process chart of the IPv4 communication equipment in the 1st embodiment of the present invention.

Figure 11 is the process chart of the name resolving equipment in the 1st embodiment of the present invention.

Figure 12 is the process chart of the mailing address conversion equipment in the 1st embodiment of the present invention.

Figure 13 is the key diagram of the 2nd communication means in the 1st embodiment of the present invention.

Figure 14 be in the 2nd communication means of the 1st embodiment of the present invention deletion by the method key diagram of the map information table of IPv4 information source port numbers.

Figure 15 is the process chart of the IPv4 communication equipment in the 2nd communication means of the 1st embodiment of the present invention.

Figure 16 is the process chart of the name resolving equipment in the 2nd communication means of the 1st embodiment of the present invention.

Figure 17 is the process chart of the mailing address conversion equipment in the 2nd communication means of the 1st embodiment of the present invention.

Figure 18 is the key diagram (its 1) about existing problem points in the source address login.

Figure 19 is the key diagram (its 2) about existing problem points in the source address login.

Figure 20 is the system construction drawing of the 2nd embodiment of the present invention.

Figure 21 is the structure chart of the IPv4 communication equipment among Figure 20.

Figure 22 is the structure chart of the name resolving equipment among Figure 20.

Figure 23 is the structure chart of the name server among Figure 20.

Figure 24 is the structure chart of the address mapping equipment among Figure 20.

Figure 25 is the key diagram according to the address mapping table of the 2nd embodiment of the present invention.

Figure 26 is the action specification figure according to the address mapping of the 2nd embodiment of the present invention.

The action flow chart of the address mapping equipment when Figure 27 is the expression reception relevant with the 2nd embodiment of the present invention from the communication of IPv4 communication equipment.

Figure 28 is the action flow chart of the address mapping equipment when representing the mapping request reception relevant with the 2nd embodiment of the present invention.

The action flow chart of the address mapping equipment when Figure 29 is the expression reception relevant with the 2nd embodiment of the present invention from the communication of IPv4 communication equipment.

Figure 30 is the action flow chart of the expression address mapping equipment relevant with the 2nd embodiment of the present invention when the deletion entry.

Figure 31 is the address mapping table key diagram relevant with the 3rd embodiment of the present invention.

Figure 32 is the action flow chart of the mapping request relevant with the 3rd embodiment of the present invention address mapping equipment when receiving.

The action flow chart of address mapping equipment when Figure 33 is the reception relevant with the 3rd embodiment of the present invention from the communication of IPv4 communication equipment.

Figure 34 is the structure chart of explanation the 4th embodiment of the present invention.

Figure 35 is the function declaration figure that the load among Figure 34 is handled dispersing apparatus.

Figure 36 is the system construction drawing of the 4th embodiment of the present invention.

Figure 37 is the structure chart of the address mapping equipment among Figure 36.

Figure 38 is the key diagram of the filter house admin table among Figure 37.

Figure 39 is the system construction drawing according to the address mapping mode of the of the present invention the 1st or 2 embodiment.

Figure 40 is the time diagram according to the address mapping mode of the 1st embodiment of the present invention.

Figure 41 is the time diagram according to the address mapping mode of the 2nd embodiment of the present invention.

Figure 42 is the system construction drawing according to the address mapping load dispersing mode of the 4th embodiment of the present invention.

Figure 43 is the structure chart of the address mapping equipment among Figure 42.

Figure 44 is the action time figure according to the 4th embodiment of the present invention.

Figure 45 is the mapping request signal key diagram among the 4th embodiment of the present invention.

Figure 46 is the key diagram according to the address mapping equipment filter house admin table of the 4th embodiment of the present invention.

Figure 47 is the address mapping mode time diagram (its 1) according to the 5th embodiment of the present invention.

Figure 48 is the address mapping mode time diagram (its 2) according to the 5th embodiment of the present invention.

Figure 49 is the mapping request signal key diagram according to the 5th embodiment of the present invention.

Figure 50 is the filter house admin table key diagram according to the address mapping equipment of the 5th embodiment of the present invention.

Figure 51 is the address mapping mode time diagram (its 1) according to the 6th embodiment of the present invention.

Figure 52 be according to the of the present invention the 6th execute the example address mapping mode time diagram (its 2).

Figure 53 is according to executing routine mapping request signal key diagram according to the of the present invention the 6th.

Figure 54 executes routine address mapping equipment structure chart according to the of the present invention the 7th.

Embodiment

Below, with reference to the accompanying drawings embodiments of the present invention are described in detail.

At first, in the following description, employed term is defined as follows:

" IPv4 communication equipment ": be meant the communication equipment that belongs to IPv4 net 11.Similarly, " IPv6 communication equipment " is meant the communication equipment that belongs to IPv6 net 13.In addition, " address " refers to mailing address.

Below, the communication system of using the 1st embodiment of the present invention is illustrated.Fig. 2 is exactly the key diagram to this communication system.This communication system is the example that is used for from the system that the IPv4 communication equipment communicates the IPv6 communication equipment.This system is provided with the name resolving equipment 15 that the name of IPv6 communication equipment is transformed to the address in IPv4 net 11.In addition, it also has a plurality of IPv4 communication equipment 121-12n.In addition, in IPv6 net 13, also have a plurality of IPv6 communication equipment 141-14n.And then, at IPv4 net 11 with on the border of IPv6 net 13, be provided with the public mailing address conversion equipment 16 (playing the equipment of gateway function) that the communication between IPv4 net 11 and the IPv6 net 13 is carried out relaying.

And, between name resolving equipment 15, a plurality of IPv4 communication equipment 121-12n, a plurality of IPv6 communication equipment 141-14n, mailing address conversion equipment 16, be provided with communication line (wireless communication line or wired communication line).

Structure to each IPv4 communication equipment is illustrated below.Fig. 3 is the structure chart of each IPv4 communication equipment.As shown in Figure 3, the IPv4 communication equipment is accepted portion 22, name resolving inquiry portion 23, information source port numbers table 24 and data transmit-receive portion 25 by APD 21, communication request and is constituted.APD 21 sends communication request; Communication request is accepted portion 22 and is accepted from the communication request of APD 21 to the IPv6 communication equipment; Name resolving inquiry portion 23 host name according to the IPv6 communication equipment, the destination address to name resolving equipment 15 inquiry IPv4 addresses; Employed information source port numbers during information source port numbers table 24 supervisory communications; Data transmit-receive portion 25 carries out the transmitting-receiving of data.

In addition, described APD 21, communication request are accepted portion 22, name resolving inquiry portion 23 and data transmit-receive portion 25, all are the treatment facility of for example realizing by executive program separately.

Below described name resolving equipment is illustrated.Fig. 4 is the structure chart of name resolving equipment.As shown in Figure 4, name resolving equipment 15 includes name resolving portion 31, and portion 35, data transmit-receive portion 36 are accepted in IPv4 virtual address table 32, map information table 33, map information notice portion 34, map information deletion.Wherein the host name that will be inquired about of name resolving portion 31 is transformed to the address of IPv6; The destination address (following brief note is " an IPv4 virtual address ") of the IPv4 address of IPv4 virtual address table 32 management notice IPv4 communication equipments; Map information table 33 manages as map information from the IPv4 address (following brief note is " an IPv4 source address ") of above-mentioned IP v4 virtual address table 32 resulting IPv6 addresses (following brief note is " an IPv6 destination address "), IPv4 virtual address, IPv4 communication equipment or IPv4 communication equipment employed information source port numbers when the IPv4 virtual address is communicated by letter; Map information notice portion 34 is the above-mentioned IPv6 destination address that obtains, IPv4 virtual information source address, IPv4 source address or information source port numbers (following brief note is " map information ") notifying communication address mapping equipment 16; The map information deletion is accepted portion 35 behind the sign off of IPv4 communication equipment to the IPv6 communication equipment, receives this map information from mailing address conversion equipment 16; Data transmit-receive portion 36 carries out the transmitting-receiving of data.

In addition, portion 35, data transmit-receive portion 36 are accepted in described name resolving portion 31, map information notice portion 34, map information deletion, all are the treatment facility of for example realizing by executive program separately.

Below described mailing address conversion equipment is illustrated.Fig. 5 is the structure chart of mailing address conversion equipment.As shown in Figure 5, mailing address conversion equipment 16 has data relay 41, map information table 42, map information and accepts portion 43, map information deletion notice portion 44, timer 45, timer 46 and data transmit-receive portion 47.Data relay 41 is relayed to the IPv6 communication equipment to the IPv4 communication equipment to the communication request of IPv4 virtual address according to map information; Map information table 42 is used to manage map information; Map information is accepted the map information that portion's 43 acceptance are notified from name resolving equipment 15; Map information deletion notice portion 44 is behind the sign off of IPv4 communication equipment to the IPv6 communication equipment, with this map information notice name resolving portion 15; The 45 monitor communication times of timer; Timer 46 monitors the interval of IP datagram; Data transmit-receive portion 47 can communicate with the communication equipment of IPv4 net or IPv6 net.

In addition, described data relay 41, map information are accepted portion 43, map information deletion notice portion 44 and data transmit-receive portion 47, all are the treatment facility by realizing with executive program for example separately.

Below described list data is described.Fig. 6 is list data key diagram (its 1).The A of this figure represents information source port numbers table, and the B of this figure represents the IPv4 virtual address table.Fig. 7 is list data key diagram (its 2) equally, and the A of this figure represents the map information table by the IPv4 source address, and the B of this figure represents the map information table by the information source port numbers.

Information source port numbers table shown in Fig. 6 A can constitute like this, and it is the information source port numbers, and the user mode information whether used of this port is mapped and logins.According to this table, for example, the information source port numbers is that the user mode of the port of 4pa is " in the use ", and the information source port numbers is that the user mode of the port of 4pa is " not using ".

Secondly, the IPv4 virtual address table shown in Fig. 6 B is the table of being managed by name resolving portion 15.This table is provided with " IPv4 virtual address " and " user mode " data item, can be in these data item logon data.That is to say, in this IPv4 virtual address table, can the combining of IPv4 virtual address, IPv4 source address and IPv6 destination address perhaps be combined information source port numbers and IPv6 destination address, its " user mode " that whether just is being used is logined.

For example, the user mode of IPv4 virtual address 4c is " (4a 6a) uses ", and the user mode of IPv4 virtual address 4d is " using ".

In addition, the map information table of pressing the IPv4 source address shown in Fig. 7 A, it is the map information table (following brief note is " IPv4 source address map information table ") that in name resolving equipment 15 or mailing address conversion equipment 16, is used for managing map information, it is provided with data item such as " IPv4 virtual address ", " IPv4 source address ", " IPv6 destination address ", can be in these data item logon data.

For example, in the illustrated case, the IPv4 virtual address logs on as 4c, and the IPv4 source address logs on as 4a, and the IPv6 destination address logs on as 6a, and perhaps the IPv4 virtual address logs on as 4c, and the IPv4 source address logs on as 4b, and the IPv6 destination address logs on as 6b.

Secondly, the information source port numbers mapping table shown in Fig. 7 B is in name resolving equipment 15 or mailing address conversion equipment 16, is used for managing the map information table (following brief note is " information source port numbers map information table ") of map information.It is provided with data item such as " IPv4 virtual address ", " information source port numbers ", " IPv6 destination address ", can be in these data item logon data.In illustrated embodiment, the IPv4 virtual address logs on as 4c, and the information source port numbers logs on as 4pa, and the IPv6 destination address logs on as 6a, and perhaps the IPv4 virtual address logs on as 4c, and the information source port numbers logs on as 4pb, and the IPv6 destination address logs on as 6b.

Below the 1st communication means that can implement in the described communication system is illustrated.Fig. 8 is the key diagram of the 1st communication means.This communication means communicates to the IPv6 communication equipment from the IPv4 communication equipment according to the map information table of IPv4 source address.

In Fig. 8, for example, from IPv4 communication equipment a.co.jp under the situation of IPv6 communication equipment aaa.com communication, IPv4 communication equipment a.co.jp sends " name resolution request " to name resolving equipment 15, the pairing IPv4 of the title aaa.com address (the step S 1 of Fig. 8) of inquiry IPv6 communication equipment aaa.com.

Received the name resolving equipment 15 of name resolution request from IPv4 communication equipment a.co.jp, by the means of regulation, the IPv4 address that has obtained IPv4 communication equipment a.co.jp is that the pairing IPv6 of the title aaa.com address of " 4a ", IPv6 communication equipment aaa.com is " 6a ".(Fig. 4 and Fig. 6 B) selects the IPv4 virtual address 4c of a free time from the IPv4 virtual address table 32 that is keeping, in its corresponding user mode hurdle, set " (4a; 6a) in the use ", this means " this IPv4 source address 4a and IPv6 destination address 6a just are used ".

Described IPv4 source address 4a, IPv4 virtual address 4c, IPv6 destination address 6a be saved in IPv4 source address map information table 33 (Fig. 4 and Fig. 7 A) thereafter.Then, this map information is notified to mailing address conversion equipment 16 (the step S2 of Fig. 8), receives the mailing address conversion equipment 16 of this map information notice, this map information is saved in the IPv4 source address map information table (Fig. 7 A).

Name resolving equipment 15 has been notified this map information after the mailing address conversion equipment 16, as to the answer from the name resolution request of IPv4 communication equipment a.co.jp, sends IPv4 virtual address " 4c " (the step S3 of Fig. 8).Obtained the IPv4 communication equipment a.co.jp that name resolution request is answered,, directly mailing address conversion equipment 16 has been begun communication (the step S4 of Fig. 8) just with this IPv4 virtual address 4c.

Mailing address conversion equipment 16 is from this signal that IPv4 communication equipment a.co.jp accepts, read " IPv4 virtual address 4c " as destination address, as " the IPv4 source address 4a " of source address, after this, this destination address 4c and source address 4a are retrieved (Fig. 7 A) as keyword to map information table simultaneously, can obtain " 6a " as the IPv6 destination address from the map information of correspondence.By using this IPv6 destination address 6a, mailing address conversion equipment 16 just can be the signal relay that is received from IPv4 communication equipment a.co.jp to IPv6 communication equipment aaa.com (the step S5 of Fig. 8).

In addition, when if IPv4 communication equipment a.co.jp is communicating by letter to IPv6 communication equipment aaa.com, the IPv4 communication equipment b.co.jp that other is arranged again is when IPv6 communication equipment bbb.com sends communication request etc., identical with aforesaid IPv4 communication equipment a.co.jp to the step that IPv6 communication equipment aaa.com communicates by letter, for example, select same IPv4 virtual address " 4c ", and utilize it to communicate (the step S ' 1 to S ' 5 of Fig. 8).

Herein, when obtaining described IPv4 virtual address " 4c ", in above-mentioned processing, the user mode of IPv4 virtual address " 4c " is " 4a, 6a " (Fig. 6 B).At this moment, (4b 6b) does not repeat by IPv4 source address " 4b " and formed communication of IPv6 destination address " 6b " with this can to judge this " user mode (4a, 6a) " state, therefore, can select same address " 4c " to be used as the IPv4 virtual address.

That is to say, according to the method, concerning the IPv4 virtual address, using login in it, is the relevant IPv4 source address that uses it to realize to communicate by letter and IPv6 destination address to be combined login.Its result, another different with the IPv6 destination address with the IPv4 source address communicated by letter, and but can use identical IPv4 virtual address.That is to say, login because the IPv4 virtual address combined together with the IPv4 source address of association and IPv6 destination address, thereby can reuse identical IPv4 virtual address.Consequently,, the IPv4 virtual address can be used effectively, thereby the communication request that can contrast actual total big several times of number of addresses is simultaneously made correspondence according to the method.

Method to relevant deletion IPv4 source address map information table is illustrated below.Fig. 9 is about the delet method schematic diagram by the map information table of IPv4 source address (brief note is " map information ").

This method behind the sign off of IPv4 communication equipment to the IPv6 communication equipment that begins as mentioned above, is deleted this map information according to IPv4 source address map information table (Fig. 7 A), and the IPv4 virtual address can be utilized again.

As shown in Figure 9, when IPv4 communication equipment a.co.jp begins to communicate by letter to IPv6 communication equipment aaa.com (the step S1 of Fig. 9), mailing address conversion equipment 16 just starts the timer that monitors above-mentioned call duration time and monitors IP datagram timer at interval.And, when receiving IP datagram, monitor that IP datagram timer at interval just is reset, to monitor that up-to-date IP datagram is at interval.

For example, the time of overflowing of supposing the timer of monitor communication time was made as 5 fens, the time of overflowing that monitors IP datagram timer at interval is made as under 5 seconds the situation, after measuring of the timer of monitor communication time passed through 5 fens, or after monitoring that measuring of IP datagram timer at interval passed through 5 seconds, just think that this communication finishes.And, this map information of deletion in the IPv4 source address map information table from remain on mailing address conversion equipment 16.

In addition, mailing address conversion equipment 16 sends to name resolving equipment 15 (the step S2 of Fig. 9) to the map information deletion notice of the aforementioned map information of deletion simultaneously.Receive the name resolving equipment 15 of this map information notice, the corresponding map information of deletion from the IPv4 source address map information table of this equipment.

Below, the processing of each equipment is elaborated.

At first, the processing to the IPv4 communication equipment describes.Figure 10 is the process chart of IPv4 communication equipment.When communication request from the IPv4 communication equipment to IPv6 communication equipment aaa.com that taken place on (step S1), communication request is accepted portion 22 and is accepted this communication request (step S2), sends to name resolving equipment 15 (step S3) from name resolving inquiry portion 23 to 25 name resolution request relevant with IPv6 communication equipment aaa.com of data transmit-receive portion.

After this, received from name resolving equipment 15 when data transmit-receive portion 25 (step S4) after the answer of name resolution request, the IPv4 virtual address is read by name resolving inquiry portion 23 from this answer, use this IPv4 virtual address, carry out accepting the data transmissions (step S5) of 22 pairs of data receiving and transmitting parts 25 of portion from communication request.

Processing to name resolving equipment is illustrated below.Figure 11 is the process chart of name resolving equipment.When the data reception portion 36 of name resolving equipment 15 has received from name resolution request that the IPv4 communication equipment is sent (step S11), the IPv4 address (step S12) of from the signal that receives, reading this IPv4 communication equipment, and the name resolution request of this IPv6 communication equipment (aaa.com) is notified to name resolving portion 31 (step S13).

In name resolving portion 31,, try to achieve the IPv6 address (step S14) of this IPv6 communication equipment with the name resolving table of this name resolution request as the key search regulation.And then, in the IPv4 virtual address table, the user mode of the IPv4 virtual address " 4c " of correspondence is set at " (4a 6a) uses " (step S15).Then, the IPv6 address of the IPv4 address of this IPv4 communication equipment, IPv6 communication equipment and above-mentioned IPv4 virtual address as map information, are saved in the IPv4 source address map information table (step S16).

In addition, for data transmit-receive portion 36, map information notice portion 34 sends the request of sending (step S17) with regard to above-mentioned map information to mailing address conversion equipment 16.After this, as the answer to the name resolution request of IPv4 communication equipment, name resolving portion 31 will send the request of sending (step S18) to data transmit-receive portion 36 with regard to this IPv4 virtual address.

On the other hand, data reception portion 36 at name resolving equipment 15, receive under the situation of above-mentioned " the map information deletion notice " sent from mailing address conversion equipment 16 (step S19), just it is notified to the map information deletion and accepts portion 34, according to the map information of this notice, deletion corresponding map information (step S20) from map information table.

Processing to the mailing address conversion equipment describes below.Figure 12 is the process chart of mailing address conversion equipment.The data transmit-receive portion 47 of mailing address conversion equipment 16 is when having accepted from aforesaid map information that name resolving equipment 15 is sent (step S21), accept portion 43 at map information and read this map information, and it is saved in (step S22) in the map information table 42.

Then, data transmit-receive portion 47 at mailing address conversion equipment 16, when accepted from the IPv4 communication equipment send aforesaid when being the signal of destination address (step S23) with the IPv4 virtual address, read this IPv4 virtual address and IPv4 source address (step S24), this IPv4 virtual address and IPv4 source address as keyword, via the data relay, from map information table 42 retrieval corresponding IPv6 destination addresses (step S25).

Then, use the IPv6 destination address obtain like this, the signal (step S26) that relaying is received from the IPv4 communication equipment of correspondence.At this moment, start timer and the supervision IP datagram timer (step S27) at interval of monitor communication time.

And then, if under the situation that the timer of described monitor communication time or supervision IP datagram timer at interval overflow, just from map information table 42, delete map information (step S28) by the communication that timer monitored.Then, be destination address with name resolving equipment 15, portion 44 sends map information deletion notice (step S29) to data transmit-receive portion 47 from map information deletion notice.

Below the 2nd communication means according to the 1st embodiment of the present invention is illustrated.Figure 13 is the key diagram of the 2nd communication means.This communication means is according to information source port numbers map information table, the method that communicates to the IPv6 communication equipment from the IPv4 communication equipment.

For example, identical with above-mentioned the 1st method, from IPv4 communication equipment a.co.jp under the situation that IPv6 communication equipment aaa.com communicates, in order to obtain the IPv4 address that name is called the IPv6 communication equipment aaa.com of aaa.com, IPv4 communication equipment a.co.jp as name resolution request, proposes inquiry (the step S1 of Figure 13) to name resolving equipment 15 with it.

Employed information source port numbers 4pa was notified to name resolving equipment 15 when at this moment, IPv4 communication equipment a.co.jp will communicate by letter with this IPv6 communication equipment aaa.com.Received the name resolving equipment 15 of name resolution request from IPv4 communication equipment a.co.jp, the IPv4 address of obtaining IPv4 communication equipment a.co.jp is " 6a " for the IPv6 address of " 4a " and IPv6 communication equipment aaa.com.

And then, in the virtual address table that is keeping, select the IPv4 virtual address of a free time, for example " 4c ", and according to the information source port numbers 4pa and the top IPv6 destination address " 6a " of having tried to achieve of above-mentioned correspondence, in this table, be set at and mean " state 4pa in the use, the 6a " that is in use., information source port numbers 4pa, IPv4 virtual address 4c, IPv6 destination address 6b be saved in " information source port numbers map information table " in, and this map information is notified to mailing address conversion equipment 16 (the step S2 of Figure 13) thereafter.

Receive the mailing address conversion equipment 16 of map information notice, this map information is saved in " information source port numbers map information table ".Name resolving equipment 15 as the answer of the name resolution request that IPv4 communication equipment a.co.jp is sent, sends this IPv4 virtual address " 4c " (the step S3 of Figure 13) after having notified mailing address conversion equipment 16 this map information.

Obtain the IPv4 communication equipment a.co.jp that this name resolution request is answered, use this IPv4 virtual address " 4c ", to the actual communication (the step S4 of Figure 13) of mailing address conversion equipment 16 beginnings.

Mailing address conversion equipment 16 is from the signal that the IPv4 communication equipment a.co.jp that has received sends, read this IPv4 virtual address 4c and information source port numbers 4pa, thereafter, with this IPv4 virtual address 4c and information source port numbers 4pa as keyword, the retrieval map information table, thus this IPv6 destination address 6a obtained.The result makes mailing address conversion equipment 16 be relayed to IPv6 communication equipment aaa.com (the step S5 of Figure 13) to the signal that receives from IPv4 communication equipment a.co.jp.

In addition, when IPv4 communication equipment a.co.jp communicates IPv6 communication equipment aaa.com, even there is other IPv4 communication equipment b.co.jp that IPv6 communication equipment bbb.com has been produced under the situation of communication request again, identical with described IPv4 communication equipment a.co.jp to the communication steps of IPv6 communication equipment aaa.com, for example, also can select same IPv4 virtual address " 4c ", communicate (step S ' the 1-step S ' 5 of Figure 13).And in the case, when trying to achieve the IPv4 virtual address, the user mode of IPv4 virtual address " 4c " is " 4pa, 6a ", judges it and does not repeat with communicating by letter of information source port numbers " 4pb ", consequently makes and selects same address 4c to become possibility.

That is to say,, therefore can reuse same IPv4 virtual address to the IPv4 virtual address because this method gets up to login with related information source port number combinations.Its result makes this method also can use the IPv4 virtual address effectively, thereby can make correspondence to reaching the actual communication request of the several times of number of addresses always.

Method to deletion map information from information source port numbers map information table describes below.Figure 14 is the delet method key diagram of information source port numbers map information table.This method is according to " information source port numbers map information table ", and after the communication of IPv6 communication equipment was finished, the correspondence mappings information in the deletion map information table made the IPv4 virtual address can obtain again utilizing at the IPv4 communication equipment that has begun.

When beginning when IPv4 communication equipment a.co.jp communicates IPv6 communication equipment aaa.com (with reference to the step S1 of Figure 14), mailing address conversion equipment 16 starts the timer of monitor communication times and monitors IP datagram timer at interval.And, monitor IP datagram timer at interval after receiving IP datagram just from horizontal reset, to monitor up-to-date IP datagram interval.

For example, the time of overflowing of supposing the timer of monitor communication time was made as 5 fens, the time of overflowing that monitors IP datagram timer at interval is made as under 5 seconds the situation, after measuring of the timer of monitor communication time passed through 5 fens, or after monitoring that measuring of IP datagram timer at interval passed through 5 seconds, just think that this communication finishes.And, in information source port mapping information table, delete corresponding map information.

In addition, except can be (promptly as the identifier of the mailing address of the mailing address that is distributed of the identifier of indication the other side communication equipment and information source communication equipment or application program, port numbers in the case) combination is used for communication, and it is notified to outside the name resolving equipment from mailing address conversion equipment 16, simultaneously, after the up-to-date communication of stating combination is before use carried out, and after having passed through predefined certain hour, mailing address conversion equipment 16 sends to name resolving equipment (with reference to the step S2 of Figure 14) to the map information deletion notice of the map information of this combination of deletion.

Received the name resolving equipment 15 of map information deletion notice, the corresponding map information of deletion from information source port numbers map information table.

Below, the processing of each equipment of this 2nd method is illustrated.

At first, the processing to the IPv4 communication equipment describes.Figure 15 is the process chart of IPv4 communication equipment.In the IPv4 communication equipment, taken place under the situation of the communication request of IPv6 communication equipment aaa.com (step S31), communication request is accepted portion 22 and is accepted this communication request (step S32), from information source port numbers table 24, extract the port numbers of unused state, this information source port numbers is logged on as state in the use (step S33).

Then, from name resolving inquiry portion 23 name resolution request and information source port numbers notices, send to data transmit-receive portion 25 (step S34) to the relevant IPv6 communication equipment of name resolving equipment 15.Data transmit-receive portion 25 receives after the answer that name resolution request is done that name resolving equipment 15 is sent (step S35), the IPv4 virtual address is read by name resolving inquiry portion 23 from this answer, use this IPv4 virtual address to accept the data transmissions (step S36) of portion 22 to data transmit-receive portion 25 from communication request.

Processing to name resolving equipment is illustrated below.Figure 16 is the process chart of name resolving equipment.Received in the data transmit-receive portion 36 of name resolving equipment 15 under the situation of the name resolution request sent from the IPv4 communication equipment and information source port numbers notice (step S41), read this information source port numbers (step S42), and the name resolution request (aaa.com) from the IPv6 communication equipment is notified to name resolving portion 31 (step S43).

In name resolving portion 31, name resolving table is according to the rules tried to achieve the IPv6 address (step S44) of corresponding IPv6 communication equipment.And then the user mode of retrieval IPv4 virtual address is not the address of " 4pa, 6a " in IPv4 virtual address table 32.As its result, for example selected the IPv4 virtual address under the situation of " 4c ", for this IPv4 virtual address, be set and be " state 4pa in the use, 6a " (step S45).

Then, in map information table 33, the IPv6 address of the information source port numbers of above-mentioned IP v4 communication equipment, IPv6 communication equipment and IPv4 virtual address are saved in " information source port numbers map information table " (step S46) as map information.For data transmit-receive portion 36, map information notice portion 34 sends the request of sending (step S47) with regard to this map information to mailing address conversion equipment 16

Then, in name resolving portion 31,, send the request of sending (step S48) to data transmit-receive portion 36 of the answer of IPv4 virtual address as the name resolution request that the IPv4 communication equipment is proposed.On the other hand, in the data transmit-receive portion 36 of name resolving equipment 15, under the situation of the map information deletion notice of having accepted to send (step S49) from mailing address conversion equipment 16, this notice is transferred to the map information deletion accept portion 35, the map information of this notice as keyword, is deleted this map information (step S50) from map information table 33.

Processing to the mailing address conversion equipment describes below.Figure 17 is the process chart of mailing address conversion equipment.The data reception portion 47 of mailing address conversion equipment 16 is under the situation of the map information of having accepted to send from name resolving equipment 15 (step S51), accept portion 43 at map information and read this map information, and it is saved in (step S52) in the map information table 42.Then, data reception portion 47 at mailing address conversion equipment 16, when accepted from the IPv4 communication equipment send be the signal of destination address with the IPv4 virtual address time (step S53), from this signal, read this IPv4 virtual address and IPv4 information source port numbers (step S54), this IPv4 virtual address and IPv4 information source port numbers as keyword, via the data relay, from map information table 42, retrieve corresponding IPv6 destination address (step S55).

Then, use the IPv6 destination address, the signal (step S56) that relaying receives from the IPv4 communication equipment.At this moment, start timer and the supervision IP datagram timer (step S57) at interval of monitor communication time.And then, if the timer of described monitor communication time or supervision IP datagram timer at interval overflow, then from map information table, delete the relevant map information (step S58) of communication that is monitored with timer.Then, sending from map information deletion notice portion 44, is destination address with name resolving equipment 15, sends map information deletion notice (step S59) to data transmit-receive portion 47.

Described the 1st embodiment of the present invention has following characteristics.That is, the 1st method of present embodiment, the combination according to IPv4 source address and IPv4 virtual address determines the IPv6 destination address.Therefore, under the situation that the communication equipment that a plurality of IPv4 nets have taken place to have simultaneously communicates the communication equipment of a plurality of IPv6 nets, as long as IPv4 source address difference just can be reused identical IPv4 virtual address.

In addition, according under the situation of the combination of information source port numbers and IPv4 virtual address decision IPv6 destination address (described the 2nd method), similarly, if information source port numbers difference also can be reused identical IPv4 virtual address.Combination according to information source port numbers and IPv4 virtual address determines under the situation of IPv6 destination address like this, when the situation that has taken place to communicate from the communication equipment that the communication equipment of a plurality of IPv4 nets is netted a plurality of IPv6, or the situation that the communication equipment of a plurality of IPv6 nets communicated from the communication equipment of same IPv4 net taken place, for above-mentioned 2 kinds of situations, can be in addition corresponding.

No matter use which method,, therefore can cut down the number that in mailing address conversion equipment 16, needs the IPv4 virtual address of distributing because same IPv4 virtual address can be repeated to use simultaneously.As long as distribute the sum of a spot of IPv4 virtual address, just can carry out relaying to the communication between large-scale IPv4 net and the IPv6 net.

In addition, as the configuration example of the more specifically equipment of described the 1st embodiment, to describing under the situation that is applied to recording medium.Described name resolving equipment 15 and mailing address conversion equipment 16, can use work station, personal computer etc. arbitrarily computer realize.This equipment is by formations such as basic computer, the display device that is connected with this main body, input equipment (keyboard/mouse etc.), removable disk drive, hard disc apparatus.And, in basic computer, be provided with ROM (nonvolatile memory), working storage, interface control part (I/F control part), communication control unit of CPU, stored program and the data of carrying out inner various control and processing etc.In addition, in described removable disk drive, floppy drive and CD-ROM drive have been comprised.

In the equipment that constitutes like this, for example, in the disk (record body) of hard disc apparatus, store the program of the processing that can realize name resolving equipment 15 or mailing address conversion equipment 16.CPU just can carry out aforesaid processing by reading this program and giving execution.

In addition, the present invention has more than and is limited to these examples, for example, in the disk of hard disc apparatus, comes stored program as follows, also can carry out this program by CPU and realize described processing.That is to say that make and be kept at program (program that miscellaneous equipment makes) in the removable disk drive by miscellaneous equipment, after by removable disk drive it being read, what be saved in hard disc apparatus has in the storage media.Perhaps, the data of the program that will send from other equipment via communication line etc. receive through communications reception portion, then these data are saved in the recording medium (disk) of hard disc apparatus.

Below the problem that exists among described the 1st embodiment is illustrated.That is to say that name resolving and actual communicating by letter are to adopt under the situation that different communication interfaces carries out when having a plurality of communication interfaces; And name resolving divides and to be undertaken by multistage, and the source address of name resolving and the source address of practical communication be under the square one, the true(-)running surely that differs of the formation of described the 1st embodiment.

For example, in Figure 18, suppose to act on behalf of server via web proxy server etc., when the communication equipment with IPv4 address communicates the IPv6 communication equipment, in this case, the IPv4 source address related with the IPv4 virtual address just become the IPv4 address of acting server, and no longer is the IPv4 address to the IPv4 communication equipment self of the communication equipment request communication of IPv6 net.

In addition, sometimes as shown in figure 19, repeat to be provided with under a plurality of situations at name resolving equipment such as DNS, the information source IPv4 address related with the IPv4 virtual address, just become the IPv4 address of name resolving equipment, rather than the IPv4 address of request IPv4 communication equipment self that IPv6 Netcom letter equipment is communicated.

In order to address the above problem, in the 2nd embodiment of the present invention, the login of source address is not in name resolving, just carries out after taking place but be controlled at actual communication, and source address is inconsistent when avoiding occurring in name resolving and during practical communication.

Figure 20 represents the formation of the 2nd embodiment of the present invention.According to the communication system of the 2nd embodiment of the present invention, include communication equipment (below be designated as the IPv4 communication equipment) 204, the IPv6 net 203 of IPv4 net 202, IPv4 net, the communication equipment of IPv6 net (below be designated as the IPv6 communication equipment) 205, name resolving equipment 206, address mapping equipment 201, name server 207.Name resolving equipment 206 is transformed to the address with the title of IPv6 communication equipment 205; 201 pairs of IPv4 nets of address mapping equipment carry out relaying with communicating by letter of IPv6 net; Name server 207 maintains the title of each communication equipment and the map information of IP address, title can be transformed to the IP address.And that IPv4 communication equipment 204 and IPv6 communication equipment 205 can have respectively is a plurality of.

Figure 21 represents the structure of each IPv4 communication equipment 204.As shown in the figure, IPv4 communication equipment 204 includes APD 221, communication request is accepted portion 222, name resolving inquiry portion 223, information source port numbers table 224 and data transmit-receive portion 225.APD 221 communicates request; Communication request is accepted portion 222 and is accepted the communication request of sending to IPv6 communication equipment 205 from APD; Name resolving inquiry portion 223 host name according to IPv6 communication equipment 205, the destination address to name resolving equipment 206 inquiry IPv4 addresses; Employed information source port numbers during information source port numbers table 224 supervisory communications.

Figure 22 is the structural representation of name resolving equipment 206.Name resolving equipment 206 includes name query portion 231, name resolving mapping judging part 232, map information request portion 233, map information and replys portion 234 and data transmit-receive portion 235.The host name that name query portion 231 will be inquired about is inquired about to name server 207; The address of name resolving mapping judging part 232 judgement result, address and other address systems that whether it is necessary or not will inquire about is shone upon; Carry out at needs under the situation of map addresses, map information request portion 233 sends the mapping request; Map information is replied portion 234 mapping result is replied communication equipment to the request name resolving of correspondence.

Figure 23 is the structural representation of name server 207.Name server 207 is accepted name resolution request, and it includes title-address translation table 242, name resolving portion 241, map information and replys portion 243 and data transmit-receive portion 244.Title-address translation table 242 keeps the corresponding relation of title and address; Name resolving portion 241 utilizes title-address translation table 242, according to title retrieval institute addresses distributed, realizes the parsing of title; Map information is replied portion 243 analysis result is replied to proposing name resolution request person.

Figure 24 is the structural representation of address mapping equipment 201.Address mapping equipment 201 includes the mapping request and accepts portion 251, address mapping table 252, mapping address determination section 253, map information notice portion 254, address mapping portion 255, data communication section 256 and timer 2 57.Mapping request is accepted portion 251 and is accepted mapping request from name resolving equipment to the IPv4 virtual address; The 253 response mapping requests of mapping address determination section, virtual assigned is carried out in retrieval and the corresponding IPv4 address of decision from address mapping table 252; Map information notice portion 254 replys corresponding result to name resolving equipment 206; Address mapping portion 255 receives actual communication, retrieval destination address and in addition conversion from address mapping table 252; Timer 2 57 is used for measuring the entry of address mapping table 252 remaining " virtual assigned " state, the life period of each entry.

Figure 25 shows the content of the address mapping table 252 that address mapping equipment 201 kept.Address mapping table 252 is made of a plurality of entry with a plurality of data item.These data item comprise final purpose address 261, source address 262, virtual destination address 263, distribution state 264.The final purpose IP address of the address management system that 261 expressions of final purpose address are different with current communication equipment; The information source IP address of source address 262 expression communication equipments; Virtual destination address 263 is used for representing the communication objective address different with the address management system of information source communication equipment; The distribution state of distribution state 264 presentation address conversion.

The number of each entry of address mapping table 252, total IPv4 number of addresses possible when having at least 202 pairs of IPv6 nets of IPv4 net 203 to carry out virtual assigned is so many.In addition, to the IPv4 address of virtual assigned, have 1 entry at least, corresponding IPv4 address is set to virtual destination address 263.

When distribution state 264 for dividing timing, the information source of source address 262 just is transformed to final purpose address 261 to the virtual destination address 263 of appointment.In addition, when distribution state 264 for distributing and when being same virtual destination address 263, can have the different entry in a plurality of and source address 262 and final purpose address 261.

When distribution state 264 is under the situation of virtual assigned, though virtual destination address 263 is assigned to final purpose address 261, source address 262 is " reservation " state still.Communication equipment is in the stage of having specified this virtual destination address 263 and having begun to communicate by letter, address mapping equipment 201 is logined the information source IP address of this communication equipment as the source address 262 of the entry of this virtual assigned, distribute and distribution state 264 changed to from virtual assigned.

Concerning distribution state 264,, do not allow to exist a plurality of entries with same virtual destination address 263 about the entry of virtual assigned.So, communication equipment is specified this virtual destination address 263 and when beginning to communicate by letter, just can be transformed to wrong final purpose address 261 to virtual destination address 263.

Figure 26 represents according to the 2nd embodiment of the present invention, the method that address mapping equipment 201 is logined source address and communicated when 204 communications of IPv4 communication equipment.For example, under the situation about IPv6 communication equipment 205 " aaa.com " being communicated from IPv4 communication equipment 204 " a.co.jp ", IPv4 communication equipment 204 " a.co.jp " proposes name resolution request to name resolving equipment 206, the IPv4 address (step S71) of the title " aaa.com " of inquiry IPv6 communication equipment 205aaa.com.

After name resolving equipment 206 has received this name resolution request that proposes from IPv4 communication equipment 204 " a.co.jp ", inquire about (step S72) as name resolution request to other the name server 207 that may maintain " aaa.com " address information.In the name server 207 that has received this name resolution request, retrieve title-address translation table 242 by name resolving portion 241, acquisition is corresponding to the IPv6 address " 6a " of " aaa.com ", and in view of the above, map information is replied 243 pairs of name resolving equipment 206 of portion and replied (step S73).

When name resolving equipment 206 has received after this name resolving replys, judge by name resolving mapping judging part 232, judge whether to be necessary to address conversion equipment 201 mapping of request address.If judged result is thought when request is necessary, the mapping request (step S74) that map information request portion 233 just proposes the IPv4 virtual address of above-mentioned " 6a " to address mapping equipment 201.

Received the address mapping equipment 201 of this map addresses request, accepted portion 251 in the mapping address request and accept this request,, determined IPv4 address, for example " 4c " corresponding to " 6a " that asked by mapping address determination section 253 search address map tables 252.Then, its result is made to name resolving equipment 206 by map information notice portion 254 reply (step S75).

Having received the name resolving equipment 206 that this map addresses is replied from address mapping equipment 201, is IPv4 virtual address " 4c " with its result, replys 234 pairs of IPv4 communication equipments 204 of portion by map information and replys (step S76).Received this name resolving result's IPv4 communication equipment 204,, sent IPv4 grouping (step S77) to the IPv4 of gained virtual address " 4c ".

With IPv4 virtual address " 4c " is this IPv4 grouping of destination address, through route control, and arrival address conversion equipment 201, it is the grouping of destination address that the data reception portion 256 of address mapping equipment 201 receives with " 4c ".The address mapping portion 255 of address mapping equipment 201 judge should " 4c " for the IPv4 grouping of destination address is the address mapping object, so search address map table 252 determines corresponding IPv6 address and is " 6a ".Thereby, the purpose IP address mapping that receives grouping is sent (step S78) for " 6a ".

, utilize flow chart herein, the action in described name resolving equipment 206 and the address mapping equipment 201 is described.The action flow chart that Figure 27 is a name resolving equipment 206 when name server 207 receives name resolvings and replys.

Among this figure, name resolving equipment 206 is according to step S71, receives name resolvings from name server 207 and replys back (step S81), and the result of name resolving is checked, sees that it is IPv4 address or IPv6 address on earth.Because be the name resolution request that source IPv4 communication equipment 204 sends, therefore should check whether it is IPv4 address (step S82) herein.If its result IPv6 address, execution in step S73 communicates with the map information of request corresponding to the virtual IP address v4 address of IPv6 address address conversion equipment 201.On the other hand, under the situation of IPv4 address, just this IPv4 address is intactly made to the IPv4 communication equipment 204 that carries out name resolution request and reply (step S84).

Figure 28 is the action schematic flow diagram of address mapping equipment 201 when having received the map addresses request.At this, describe as the example that shines upon with the virtual destination address of IPv4 corresponding to IPv6 address " 6a ".

Address mapping equipment 201 is according to step S74, received (step S91) after the map addresses request from name resolving equipment 206, in address mapping table 252, whether retrieval has distribution state 264 to be unappropriated entry (step S92), its result is if exist the words of unappropriated entry, just login " 6a " in the final purpose address 261 of this entry, its distribution state 264 then is set at virtual login, and the state of source address 262 is " reservation ".And then, the virtual assigned address 252 of this entry, as replying of map addresses, to name resolving equipment 206 set by step S75 communicate (step S95).

On the other hand, the result for retrieval of above-mentioned steps S92 is not if having under the situation of unallocated entry, and whether retrieval this time in address mapping table 252, has the entry (step S93) of distribution state 264 for having distributed.If the entry that has distributed is arranged, just make the new login item that has identical virtual destination address 263 with the entry that has distributed, and it is appended in the address mapping table 252.Then, login " 6a " in the final purpose address 261 of this entry that appends, its distribution state 264 then is set at virtual login, and the setting state of its source address 262 is " reservation ".And then, the virtual assigned address 263 of this entry as the replying of map addresses, according to the communication of step S75, is sent (step S96) to name resolving equipment 206.

If above-mentioned steps S92, the result for retrieval of S93 is that the distribution state 264 of whole entries of address mapping table 252 is words of virtual assigned state, because may not carry out the virtual assigned address 263 of virtual assigned to current map addresses request, this map addresses request is rejected (step S94).In addition, the processing sequence of step S92, step S93 can be changed.

Figure 29 is address mapping equipment 201 action flow chart when receiving the communication packet that IPv4 communication equipments 204 send.

After address mapping equipment 201 had received the communication packet (step S1001) that sends from IPv4 communication equipment 204 according to step S77, address mapping equipment 201 was judged whether in addition address conversion processing (step S1002) of this communication packet.Whether this judgement is performed such, be the conversion process object address that is logged in advance in the address mapping equipment 201 by the destination address of checking this grouping for example.According to judged result, if this grouping is not that 201 pairs of these communication packet of address mapping equipment are not carried out any action (step S1003) under the situation of grouping of conversion process object.

On the other hand, if it is the grouping of transforming object, just check whether this grouping includes communication and begin request (step S1004), as whether this grouping being included the method for discrimination that communication begins to ask, both can differentiate whether contain the particular communication initiation command in this communication packet, can judge also whether the port numbers that has in this communication packet points to the certain port number of the beginning that is used to communicate by letter.

If the result of above-mentioned judgement includes communication in communication packet to begin request, then whether retrieval exists such entry in address mapping table 252: distribution state 264 is source address and this virtual destination address 263 consistent (step S1005) of virtual assigned state and this communication packet.The result of retrieval if there is corresponding entry in the address mapping table 252, just sets the source address of this communication packet in the source address 262 of this entry, its distribution state is made as distributes (step S1006).Its result specifies the grouping of the virtual destination address 263 of this entry to be transformed to the communication packet of the final purpose address 261 that sends to same entry with same source later.In addition, if there is not corresponding entry in the result of above-mentioned retrieval in the address mapping table 252, then this communication packet is just abandoned (step S1007).

On the other hand, begin to ask if receive to divide into groups not comprise, then whether have such entry in the search address map table 252: the distribution state of this entry 264 for distributed and the transmission destination address of this communication packet consistent with virtual destination address 263, and the source address of this communication packet and source address 262 consistent (step S1008).If there is such entry in the result of retrieval in address mapping table 252, as mentioned above, it is the communication packet (step S1009) of destination address that this communication packet is transformed to the final purpose address 261 of this entry.On the other hand, if there is not such entry in address mapping table 252, then this communication packet is abandoned (step S1007).

Figure 30 deletes those to keep the motion flow schematic diagram of the entry of virtual assigned state in address mapping table 252.Made distribution state 264 in the address mapping table 252 and be (step S111) behind the entry of virtual assigned state, just started the timer 2 57 (step S112) that independently to measure respectively each entry.Then, whether the measured value of investigation timer 2 57 has surpassed predetermined setting (step S113), if surpass, entry is set at unallocated state (step S114), if do not surpass, whether the distribution state 264 of then checking this entry is changed to distribution state, if be changed to distribution state, just ends the measurement to this timer.

In addition,,, perhaps can confirm as under the situation of sign off, also can delete this entry with the communications command of this communication packet if passed through the regular hour since determining in the end to use even distribution state 264 is distribution state.

Like this, according to the 2nd embodiment of the present invention, communication request the processing stage, for the IPv4 virtual address, the source address hurdle is made as " reservation " in advance, only the corresponding IPv6 destination address of login.And then, actually should communication at first, the source address of the grouping that information source IPv4 communication equipment is sent is as logining corresponding to the source address of above-mentioned IP v4 virtual address.Its result for this IPv4 virtual address, always logins correct source address.

Even under the situation of above-mentioned the 2nd embodiment of the present invention, when same IPv4 communication equipment 204 communicates with a plurality of different IPv6 communication equipments 205, at this moment,, just there is the possibility that correctly to communicate by letter if same virtual address is assigned with.If IPv4 communication equipment 204 is as mobile phone, can not be simultaneously and a plurality of IPv6 communication equipment 205 communicate, such problem just can not take place.In addition, in fact,, distribute the possibility of same virtual address also very low even 204 whiles of same IPv4 communication equipment and a plurality of IPv6 communication equipment 205 communicate.But below Shuo Ming the 3rd embodiment provides a kind of like this constructive method, even such situation occurred, also can correctly communicate by letter.

Figure 31 is the schematic diagram of the address mapping table 252 that kept of the address mapping equipment 201 according to the 3rd embodiment of the present invention.In the address mapping table 252 of present embodiment, each entry is appended information source port numbers 121, it can distinguish a plurality of communications of same IPv4 communication equipment 204 as application program identification.And then, in the distribution state of correspondence for dividing timing, the received communication grouping, source address in this communication packet is consistent with the content of the data item 262 of this entry, and the information source port numbers with action on the IPv4 communication equipment 204 of this source address 262 also content with the data item 321 of above-mentioned entry is consistent, and under the specified virtual address of this communication packet situation consistent, the destination address of this communication packet is transformed to the final purpose address 261 of this entry with the content of the data item 263 of above-mentioned entry.

Figure 32 is the action schematic flow diagram of the address mapping equipment 201 among the 3rd embodiment when having received the map addresses request.Herein, to be illustrated corresponding to the example that is mapped as between the virtual destination address of IPv4 of IPv6 address " 6a ".

When address conversion equipment 201 has received from the name resolving equipment 206 mapping request that S74 sent set by step (step S131), in address mapping table 252, whether retrieval exists distribution state 264 to be unappropriated entry (step S132).If there is unappropriated entry, just login " 6a " in the final purpose address 261 of this entry, distribution state 264 is set at " virtual assigned ", and source address 262 and information source port numbers 321 are " reservation " state.In addition, the virtual assigned address 263 of this entry as the replying of map addresses, according to the communication of step S75, is sent to name resolving equipment 206 (step S135).

On the other hand, if above-mentioned result for retrieval is not have unappropriated entry in the address mapping table 252, then whether retrieval exists the entry (step S133) of distribution state 264 for having distributed in address mapping table 252.If there is the entry that has distributed, just make a new entry, it has identical virtual destination address 263 with the entry that this has distributed, and it is added in the address mapping table 252.And then, login " 6a " in the final purpose address 261 of this entry, distribution state 264 is set at " virtual assigned ", and source address 262 and information source port numbers 321 are made as " reservation " state.In addition, the virtual assigned address 263 of this entry as the replying of map addresses, according to the communication of step S75, is sent to name resolving equipment 206 (step S136).

In addition, according to above-mentioned result for retrieval, when if the distribution state 264 of all entries in the address mapping table 252 is the virtual assigned state, to current map addresses request, because there is not possibility to carry out the virtual assigned address 263 of virtual assigned, this map addresses request is rejected (step S134).In addition, the processing sequence of step S132, step S133 can be changed.

Figure 33 is the action flow chart when address mapping equipment 201 receives from communication packet that IPv4 communication equipment 204 is sent in the 3rd embodiment.

In the figure, after address mapping equipment 201 received the communication packet (step S141) of IPv4 communication equipment 204 according to step S77 transmission, address mapping equipment 201 judged whether should carry out address conversion processing (step S142) to this communication packet.This judgement can be with checking whether it is that the conversion process object address of login in address mapping equipment 201 made in advance.According to the result who judges, if it is not when being the grouping of conversion process object communication, 201 pairs of these communication packet of address mapping equipment are not just done any processing (step S143).

On the other hand, when being the grouping of conversion process object communication, just check whether it is the grouping (step S144) that communication begins to ask as if this communication packet.As the method for discrimination that communication begins to ask, can adopt and judge whether this communication packet is the method for particular communication initiation command, perhaps adopt the port numbers judge communication packet whether to point to be used to communicate by letter the method for the specific port numbers that begins.

Result according to this judgement, if receive when dividing into groups to be the grouping that begins to ask, whether retrieval exists such entry in address mapping table 252: source address that its distribution state 264 is virtual assigned state and this communication packet and the virtual destination address of this entry 263 consistent (step S145).The result of retrieval, if when having corresponding entry in the address mapping table 252, just in the source address 262 of this entry, login the source address of this communication packet, in the information source port numbers hurdle 321 of same entry, login the information source port numbers of this communication packet, and its distribution state hurdle is changed to " distributing " (step S146).

As its result,, be transformed to the communication packet of the final purpose address 261 that sends to this entry later on by the communication packet of the virtual destination address 263 of this entry of the same program appointment of execution on same IPv4 communication equipment 204.

On the other hand, according to the result of above-mentioned retrieval, if when not having corresponding entry in the address mapping table 252, this communication packet is just abandoned (step S147).

In addition, if receive grouping is not to begin the request grouping, then whether have such entry in the search address map table 252: its distribution state 264 for distributed and the transmission destination address of this communication packet consistent with virtual destination address 263, and the source address of this communication packet and source address 262 information source port numbers consistent, this communication packet simultaneously and information source port numbers 321 unanimities (step S148).The result of retrieval, if there is such entry in address mapping table 252, then to be transformed to the final purpose address 261 of this entry be the communication packet (step S149) of destination address to this communication packet.

In addition, according to result for retrieval, if when not having such entry in address mapping table 252, this communication packet is abandoned (step S147).

So, according to the 3rd embodiment,, also can distribute identical IPv4 virtual address to them even have the IPv4 communication equipment of same source address when carrying out a plurality of communication simultaneously.That is to say, although these a plurality of communications are sent from the IPv4 communication equipment with same source address, but because they have different port numbers, as long as after this port numbers and this IPv4 virtual address merging login, just can correctly distinguish them, thereby can correctly communicate the IPv6 communication equipment.

Above-mentioned address mapping equipment omits its hardware in the diagram, for example, it can be realized by comprising External memory equipments such as one or more CPU, main storage device, hard disk, communication equipment and connecting the computer that their bus etc. constituted.This computer is made its software program that plays a role as address mapping equipment, can be stored in the suitable recording medium such as computer-readable portable medium memory device, semiconductor memory, hard disk.

Below, to how the formation of the processing load dispersing of the address mapping equipment in the foregoing description to a plurality of address mapping equipment being illustrated.

For as the address mapping mode of the various embodiments described above of the present invention, after the mapping request signal or mapping notification signal that name resolving equipment sends, send signal of communication from communication terminal again, formed group of reciprocal 2 communications of distinct device as a communication, for load dispersing is carried out in such communication, can consider such method: mapping request signal of sending from name resolving equipment or mapping notification signal are carried out load dispersing at the load dispersing equipment of regulation, send mapping signal or mapping request notification signal to an address mapping equipment, and each address conversion equipment handled be that the data of destination address send to this address mapping equipment (with reference to Figure 34,35) with the virtual address set.

In this case, when if the signal that name resolving equipment sends is mapping request signal or notification signal, must set like this: with signal strategy according to load dispersing on the load dispersing equipment of correspondence, be sent to specific address mapping equipment, the signal of the virtual destination address that each address conversion equipment is managed is sent to the corresponding address conversion equipment.Perhaps, if the signal that name resolving equipment sends is mapping request signal or notification signal, must set like this: on load dispersing equipment according to the strategy of load dispersing, send it to specific address mapping equipment, the signal of the virtual destination address that all addresses conversion equipment is managed is sent to all addresses conversion equipment.

Below Shuo Ming the 4th embodiment of the present invention provides the formation that the load dispersing of the address mapping that can implement to be accompanied by complexity like this is effectively handled.

Figure 36 is system's pie graph of the 4th embodiment of the present invention.Among the figure, 411-41n is an address mapping equipment, and each is made of address mapping portion 4101, filter house 4102, communication process portion 4103 as shown in figure 37.Each address conversion equipment is from mapping request signal or mapping notification signal that communication process portion 4103 is received, utilized the infologic value according to what login in the admin table by filter house 4102 management, extract part or all of received signal, according to specifying logic to carry out computing, see that its operation result is whether in the value scope (with reference to Figure 38).In the time of in the value scope, just the signal of this reception is sent to address mapping portion 4101, in the time of not in the value scope, just abandons this signal.

Address mapping portion 4101, the same with the processing in the address mapping equipment of above-mentioned various embodiments of the present invention, for agreement 1 (that is, communication equipment 421-42n in address net IPv4 for example) and agreement 2 (that is, IPv6 for example) communication between the communication equipment 431-43n in the address net, address mapping is carried out in mapping according to the map table of managing these communications, makes mutual communication become possibility.

Communication equipment 421-42n is the communication equipment of the address system of agreement 1, is the equipment that can communicate at the equipment room in the net of the address of agreement 1.And communication equipment 431-43n is the communication equipment of the address system of agreement 2, similarly, is the equipment that can communicate at the equipment room in the net of the address of agreement 2.

Utilize address mapping equipment 411-41n, when shining upon between the communication equipment of the communication equipment of agreement 1 and agreement 2, name resolving equipment 440 just sends the mapping request signals to connection device 451.On the other hand, in name resolving equipment, when between the communication equipment of the communication equipment of agreement 1 and agreement 2, shining upon, just send the mapping notification signals to connection device 451.

Connection device 441 sends to whole address conversion equipment 411-41n to the signal that the communication equipment of name resolving equipment 440 or agreement 1 sends.

In system as shown in figure 36, in fact, communication equipment 421-42n as agreement 1, can use the personal computer/notebook of IPv4 address system etc., communication equipment 431-43n as agreement 2, can use personal computer/notebook, PDA, mobile phone of IPv6 address system etc., can use DNS etc. as name resolving equipment 440, as connection device 451, can use switching regulator hub/hub etc., as address mapping equipment 411-41n, can use gateway etc.

In addition, address mapping portion 4101 filter houses 4102 of address mapping equipment, communication process portion 4103 can be used as hardware and install respectively, perhaps also can be used as software and install respectively, also can combine hardware and software and install.

Before describing the 4th embodiment of the present invention in detail, for the convenience that illustrates, the formation to described the 1st embodiment of the present invention and the 2nd embodiment is illustrated jointly with Figure 39 to 41 once more.

That is to say, for example different mailing address systems or different mailing address management system as IPv4 net and IPv6 net, when hope from IPv4 communication equipment 421 during to IPv6 communication equipment 432 communication, at first, send the name resolution request signal (step S201, step S221) of the address of IPv6 communication equipment 432 to name resolving equipment 440 from IPv4 communication equipment 421.

Under the situation that the virtual address that address and IPv4 to IPv6 communication equipment 432 net is shone upon, name resolving equipment 440 sends to address mapping equipment 410 to mapping notification signal (step S202), and for address mapping equipment 410, under the situation that the virtual address that address and IPv4 to IPv6 communication equipment 432 net is shone upon, just mapping request signal (step S222) is sent to address mapping equipment 410.

Even address with this address mapping equipment 410, the address of different virtual address set, address mapping equipment 410 also should be set to can received signal, when having received above-mentioned mapping request signal (step S222), login (step S223) after current available virtual address 1 being mapped to the address of IPv6 communication equipment 432, as the answer signal of mapping request signal, the virtual address 1 after the mapping is sent to name resolving equipment 440 (step S224).

Name resolving equipment 440 turns back to IPv4 communication equipment 421 (step S225) to the result of virtual address 1 as name resolving, and 421 pairs of virtual addresses 1 of IPv4 communication equipment are sent communication request (step S226).Be received on address mapping equipment 410 with the signal of virtual address 1 as destination address, on address mapping equipment 410,, it is transformed to the signal that points to the IPv6 communication equipment address according to listed map information, and to IPv6 net transmission communication request (step S227, step S228).

In addition, to address conversion equipment 410, when having received the mapping notification signal (step S203), the address of the IPv6 communication equipment 432 in the notification signal and the virtual address 1 (step S204) of IPv4 net are shone upon in login, and return confirmation signal (step S205) to name resolving equipment 440.

Name resolving equipment 440 just returns to IPv4 communication equipment 421 (step S206) to virtual address 1 as the result of name resolving after having accepted confirmation signal.The virtual address 1 that 421 IPv4 that return according to name resolving equipment 440 of IPv4 communication equipment net is sent communication request (step S207).With this virtual address 1 is the signal of destination address, received by address mapping equipment 410, address mapping equipment 410 is transformed to the address of pointing to the IPv6 communication equipment according to listed map information with it, and then, communication request is sent to IPv6 net (step S208).

Formation for such the 1st, 2 embodiment of the present invention, but Figure 42 represents the pie graph according to the concrete system of the application address conversion load dispersing mode of described the 4th embodiment of the present invention, Figure 43 represents the structure chart of each address conversion equipment, the 44th figure represents the action time figure according to the 4th embodiment, Figure 45 represents to shine upon request signal, and Figure 46 represents the admin table of the filter house 4112 among Figure 43.

In the 4th embodiment of the present invention, for example, hope when IPv6 communication equipment 431 is communicated by letter, at first, sends the name resolution request signal (step S243) relevant with the address of IPv6 communication equipment 431 from IPv4 communication equipment 422 to name resolving equipment 440 from IPv4 communication equipment 422.Name resolving equipment 440 sends to connection device 451 to this mapping request signal, and connection device 451 sends to all address mapping equipment 411-41n to this mapping request signal.

In the admin table that filter house had of each address conversion equipment 411-41n, every kind of received communication type all there is its set point, in the IPv4 net address set that may receive, be provided with virtual address (Figure 46) by the IPv4 net of address mapping portion 4111 management.In addition, preestablished judgment standard on this mapping request signal hurdle, which part of judging the mapping request signal is corresponding to what logic, can send (step S241, S242) to address mapping portion 4111 in what span.When result of calculation during, just abandon this signal (step S245) not in span.

Under the situation of the 4th embodiment of the present invention, the serial number (with reference to Figure 45) of the mapping request signal that is received for each address conversion equipment 411-41n, according to the value of its Hash of the specified logical calculated of above-mentioned admin table (hash) function, its result is assumed to " 1a ".Result of calculation according to this hash function, the mapping request signal that the filter house of address mapping equipment 411-41n is abandoned receiving separately, and have only the filter house 4112 of unique address mapping equipment 411 to deliver mapping request signal (step S246) to address mapping portion 4111.

Address mapping portion 4111 logins the virtual address 3 of IPv6 net address 431 in this mapping request signal and current available IPv4 net in the mapping transformation table (step S247).As replying of mapping request signal, the virtual address 3 that above-mentioned IP v4 is netted sends to name resolving equipment 440 (step S248).

Name resolving equipment 440 as the name resolving result, returns to IPv4 communication equipment 422 (step S249) to the virtual address 3 of IPv4 net, and IPv4 communication equipment 422 utilizes the virtual address 3 of IPv4 net to send communication request (step S250).

With the virtual address 3 of IPv4 net signal as destination address, via connection device 451, send to whole address conversion equipment 411-41n, filter house in each address conversion equipment, the receivable IPv4 net address set (step S251) of logining in the searching, managing table if corresponding address exists, then sends the signal that receives to address mapping portion 4111 (step S252), if corresponding address does not exist, then abandon the signal of this reception.

This, the filter house 4112 that has only address mapping equipment 411 sends the signal that receives to address mapping portion 4111 (step S252), and the filter house of other address mapping equipment is then abandoned the signal that received.In addition, in this case, the address mapping portion 4111 of address mapping equipment 411, according to log form, search the virtual address 3 pairing IPv6 communication equipments 431 of the IPv4 net of received data, behind the address substitute,, thereby make the communication between IPv4 communication equipment 422 and the IPv6 communication equipment 431 become possibility to the IPv6 communication equipment transmission communication request of IPv6 net.

Below, the 5th embodiment of the present invention is illustrated.It is a distortion that is associated with the 4th embodiment of the invention described above.To the 5th embodiment, have the system configuration identical as shown in figure 42 with the 4th embodiment.Figure 47, Figure 48 are the action time figures according to the 5th embodiment, and Figure 49 represents the mapping notification signal of this embodiment, and Figure 50 represents the admin table of the filter house of this embodiment.

For example, wish from IPv4 communication equipment 422 when 431 communications of IPv6 communication equipment, at first, the name resolution request signal (step S262) that sends about the address of IPv6 communication equipment 431 to name resolving equipment 440 from IPv4 communication equipment 422.Name resolving equipment 440 is selected current available to IPv4 net virtual address and corresponding with this request signal (step S262), manage its content with table, the address of IPv6 communication equipment 431 and IPv4 net virtual address are set in the mapping notification signal (with reference to Figure 49), send to connection device 451 then.451 of connection devices send to all address mapping equipment 411-41n (step S264) to the mapping notification signal.

In the admin table of the filter house of each address conversion equipment 411-41n, the set point (with reference to Figure 50) that every kind of received communication type is arranged, preestablished judgment standard in this mapping notification signal hurdle, which part of judging the mapping notification signal is corresponding to what logic, can send (step S261) to address mapping portion in what span.When result of calculation is not in span, just abandon this signal.

Under the situation of the 5th embodiment, each address conversion equipment 411-41n removes with the logic " FF " that admin table is specified, and asks its remainder the whole information of the mapping notification signal of reception.Suppose that its result is " 1A ".In this case, result of calculation according to the remainder of this division, the filter house of each address conversion equipment 412-41n is just abandoned the mapping notification signal that receives, and has only the filter house 4112 of unique address mapping equipment 411 to deliver mapping notification signal (step S265, S266) to address mapping portion 4111.That is, in this wise, the filter house 4112 of each address transformation component is set.

Address mapping portion 4111 extracts the virtual address 4 of IPv4 net from the mapping notification signal of correspondence, and it is signed in in the map table of corresponding address transformation component 4111, and in the receivable IPv4 net virtual address set of filter house 4112 (step S268, S269), as the affirmation signal of replying, send to name resolving equipment 440 (step S270) to the mapping notification signal.

Name resolving equipment 440 as the name resolving result, turns back to IPv4 communication equipment 422 (step S271) to the virtual address 4 of above-mentioned IP v4 net.422 virtual addresses 4 of using above-mentioned IP v4 net of IPv4 communication equipment are sent communication request.Virtual address 4 with this IPv4 net is the signal of destination address, via connection device 451, send to all address conversion equipment 411-41n (step S272), the filter house in each address conversion equipment is retrieved the address set that the receivable IPv4 that is logined in its admin table nets.

According to result for retrieval, if there is corresponding address, just the signal that receives is handed to address mapping portion 4111, if there is no corresponding address is then abandoned the signal (step S273) that receives.This, according to above-mentioned processing, owing to have only filter house 4112 logins of address mapping equipment 411 that the virtual address 4 of IPv4 net is arranged, therefore the signal that receives is handed to address mapping portion 4111 (step S274), the signal that filter house received of other address mapping equipment is then abandoned.

Address mapping portion 4111, according to log form, address transition is the address (corresponding with the virtual address 4 that the IPv4 of the data that received nets) to Pv6 communication equipment 431, and the IPv6 communication equipment 431 of IPv6 net sent communication request (step S275, S276), thereby make the communication between IPv4 communication equipment 422 and the IPv6 communication equipment 431 become possibility.

Below the 6th embodiment as the another variation that is associated with the 4th, the 5th embodiment of the invention described above is illustrated.The 6th embodiment has shown in Figure 43 and the identical system configuration of the 4th, the 5th embodiment, and Figure 51, Figure 52 represent its action time figure, use mapping notification signal shown in Figure 49, and use the admin table of filter house shown in Figure 50.

Same as the previously described embodiments, for example, hope when IPv6 communication equipment 431 is communicated by letter, at first, sends the name resolution request signal (step S282) of the address of relevant IPv6 communication equipment 431 from IPv4 communication equipment 422 to name resolving equipment 440 from IPv4 communication equipment 422.This request signal (step S283) is selected and be mapped to 440 pairs of current available IPv4 net virtual addresses of name resolving equipment, manage its content with table, address and selecteed IPv4 net virtual address corresponding to the IPv6 communication equipment 431 that shines upon notification signal are set in the mapping notification signal (with reference to Figure 49), send to connection device 451 then.451 of connection devices send to all address mapping equipment 411-41n to the mapping notification signal.

In the admin table that filter house had of each address conversion equipment 411-41n, every kind of received communication type all there is its set point (with reference to Figure 53), in its mapping notification signal hurdle, which part of having set the mapping notification signal is corresponding to what logic, can send (step S281) to address mapping portion in what span.When result of calculation is not in span, just abandon this signal.

Under the situation of the 6th embodiment, the serial number of the mapping request signal that is received for each address conversion equipment 411-41n, according to the value of its hash function of the specified logical calculated of admin table, its result is assumed to " 1A ".Result of calculation according to this hash function, for example, the mapping request signal that the filter house of address mapping equipment 412-41n is abandoned receiving, and have only the filter house 4112 of address mapping equipment 411 to deliver mapping request signal (step S285, S286, S287) to address mapping portion 4111.At this moment filter house 4112 extracts the virtual address 4 of the IPv4 net in the mapping notification signal, signs in to receivable IPv4 net virtual address set (step S286).

Address mapping portion 4111 extracts the virtual address 4 of the IPv4 net in the mapping notification signal, and sign in in the map table of address mapping portion 4111 (step S288), and it as mapping the replying of notification signal, send confirmation signals (step S289) to name resolving equipment 440.Just carry out situation with above-mentioned 5th embodiment under same action (step S290 to S296) thereafter.

Figure 54 is the structural representation for the address mapping equipment 411 of the 7th embodiment applicable of the present invention of the 4th to the 6th embodiment of the invention described above.Herein, the cpu load rate or the memory usage of information on load obtaining section 4115 these address mapping equipment of investigation, and notice configuration part 4114.The configuration part is by data transmit-receive portion 4113, and the address mapping equipment separately cpu load rate or memory usage are notified to other similarly, also receives the cpu load rate or the memory usage of other address mapping equipment.

For example, when address mapping equipment 411 is main address mapping equipment, cpu load rate or the memory usage that send according to each address conversion equipment 412--41n configuration part 4114, and come the computing burden apportionment by information on load obtaining section 4115 obtained cpu load rate or memory usages, the numerical value as judgment standard that to set the value of the mapping request signal of filter house 4112-41n2 or mapping notification signal is notified to the configuration part 4124-41n4 of each address conversion equipment 412-41n.In addition, in filter house 4112-41n2 separately, set the new numerical value of determining.

Receive the configuration part 4124-41n4 of each address conversion equipment 412--41n of new numerical value, in filter house 4112-41n2 separately, set this numerical value.Thereby, just can realize the load dispersing processing according to new strategy.Therefore, in this case,, just can effectively utilize more as each address conversion equipment of handling calculation resources owing to the strategy that has adopted corresponding to actual each address transformation component processing load condition at that time.

So, according to the present invention,, just no longer need so-called hardware load dispersing equipment as long as in address mapping equipment, filter house is set.The communication setting of the complexity that also just can simplify the setting of address conversion equipment effectively and must carry out thereupon.

[invention effect]

According to the present invention, because the address mapping institute when carrying out the communication internetwork communication of different address systems The virtual address of using connects the terminal address of same communication network or the application program identification of regulation advances together The row login, therefore, identical virtual address also can be reused simultaneously, thereby can effectively use branch Join the virtual address that is restricted.

Claims

1. a communication equipment is used for communicating between a plurality of communication networks of different address systems, it is characterized in that this communication equipment has:

Entering device, it logins the combination of the terminal address of the application program identification of the terminal address of the 1st communication network or regulation and the 2nd communication network;

Address conversion device, it carries out address mapping according to the content that this entering device is logined,

It is characterized in that: the address system according to the 1st communication network distributes the address of a temporary address as the terminal in the 2nd communication network, and this temporary address combines with information source terminal address and/or application program identification and is logged.

2. communication equipment as claimed in claim 1 is characterized in that having delete device, and when the up-to-date communication of correspondence begins, and through behind the official hour, this delete device is deleted the combined information that described entering device is logined.

3. communication equipment as claimed in claim 1 is characterized in that, also has the virtual address distributor, and this virtual address distributor is to the address of the address system of another communication network, distributes virtual address by the address system of a communication network,

Described entering device combines the terminal address corresponding to the application program identification of the terminal address of certain communication network of this virtual address or regulation and another communication network and logins.

4. as any one described communication equipment among the claim 1-3, it is characterized in that, described entering device is when this communication begins to the login of the application program identification of a terminal address or regulation, and the communication data that sends with reference to the terminal from this communication network carries out.

5. as any one described communication equipment among the claim 1-3, it is characterized in that described address conversion device is to be made of a plurality of address conversion devices, carry out the address mapping between different address systems when they communicate between described a plurality of communication network,

This communication equipment also comprises filter, and to each communication unit, filter is determined the actual address conversion device that carries out address mapping from described a plurality of address conversion devices.

6. communication equipment as claimed in claim 5, it is characterized in that, it also comprises the communicator that the processing load condition to each address conversion device communicates, according to the processing load condition of resulting each address conversion device of communication by described communication unit, described filter is controlled the address conversion processing burden apportionment rate of each communication.

7. an address mapping equipment when being used for communicating, carries out address mapping between a plurality of communication networks between a plurality of communication networks of different address systems, it is characterized in that,

Have address conversion device, address mapping is carried out in its combination according to the terminal address of the application program identification of the terminal address of the 1st communication network or regulation and the 2nd communication network,

8. address mapping equipment as claimed in claim 7 is characterized in that, described entering device is when this communication begins to the login of the application program identification of a terminal address or regulation, and the communication data that sends with reference to the terminal from this communication network carries out.

9. a name resolving equipment when being used for communicating, is transformed to corresponding address to the title of communication counterpart between a plurality of communication networks of different address systems,

Have the title converting means, it is according to the combination of the terminal address of the application program identification of the terminal address of the 1st communication network or regulation and the 2nd communication network, obtains the regulation corresponding relation used the address,

10. name resolving equipment as claimed in claim 9 is characterized in that having notifying device, and the regulation corresponding relation that this notifying device is used the resulting address mapping of name resolving device is notified to the address mapping equipment that carries out address mapping.

11. a communication system communicates between a plurality of communication networks of different address systems, this communication system has:

Address conversion device, the content that it is logined according to this entering device is carried out address mapping,

Described entering device is that the communication data that sends with reference to the terminal from this communication network carries out when this communication beginning to the login of the application program identification of a terminal address or regulation,

12. an address mapping equipment, the 1st communication equipment that communicates in the address of utilize observing the 1st agreement uses when communicating with the 2nd communication equipment that is endowed the address of observing the 2nd agreement, and this address mapping equipment has:

Mapping address decision unit for each address of the 1st communication equipment, to described the 2nd communication equipment, distributes the virtual address of observing the 1st agreement;

The address mapping table memory cell, be used for the memory address map table, in this table with the address of described the 1st communication equipment of information source, the described mapping address decision described virtual address that the unit distributed, be mapped with the address of the 2nd agreement of observing the 2nd communication equipment and carry out record;

The Data Receiving unit, receive to observe the 1st agreement, to the communication of the described virtual address of described the 1st communication equipment;

The address mapping unit, the described address mapping table of being stored according to described address mapping table memory cell be the communication scaling to described virtual address of observing the 1st agreement to the communication in accordance with the address of the 2nd agreement of the 2nd communication equipment;

Data transmission unit sends to the 2nd communication equipment to the communication of the 1st communication equipment of described address mapping unit institute conversion, in this address mapping equipment,

The described virtual address of having distributed the 2nd communication equipment from decision unit, described address, till the 1st communication equipment used the described virtual address of the 2nd communication equipment and the 2nd communication equipment to communicate, the address mapping table memory cell was storing as reserved state corresponding to the address described virtual address, described the 1st communication equipment of the 2nd communication equipment.

13. address mapping equipment as claimed in claim 12 is characterized in that,

After the described virtual address of having distributed the 2nd communication equipment, till the 1st communication equipment used the described virtual address of the 2nd communication equipment and the 2nd communication equipment to communicate, described virtual address was not used to the new distribution of the 2nd communication equipment.

14. as claim 12 or 13 described address mapping equipment, it is characterized in that,

In the certain hour after the described virtual address of distributing the 2nd communication equipment, when the 1st communication equipment can not carry out the communication of the described virtual address of the 2nd communication equipment, described virtual address can be used to the new distribution of the 2nd communication equipment.

15. address mapping equipment as claimed in claim 12 is characterized in that,

The address mapping table storage device is mapped the described virtual address of the address of described the 2nd communication equipment, the 2nd communication equipment, the information source port numbers that is added in communication on the address of the 1st communication equipment, described the 1st communication equipment and stores,

When having distributed the described virtual address of the 2nd communication equipment, the information source port numbers of the communication of sending request for allocation, sign in to corresponding to described virtual address, be stored in the described information source port numbers in the described address mapping table storage device.

16. an address mapping equipment, the 1st communication equipment that communicates when the address of utilize observing the 1st agreement uses when communicating with the 2nd communication equipment that is endowed the address of observing the 2nd agreement, and this address mapping equipment has:

The address mapping table memory cell, be used for the memory address map table, in this table, the address of described the 1st communication equipment of information source, the described mapping address decision described virtual address that the unit distributed, the address of observing the 2nd agreement of the 2nd communication equipment be mapped and carry out record;

The communication to the described virtual address of described the 1st communication equipment in the 1st agreement receive to be observed in the Data Receiving unit;

The address mapping unit, the described address mapping table of being stored according to described address mapping table memory cell be the communication scaling to described virtual address of observing the 1st agreement the communication in accordance with the address of the 2nd agreement to the 2nd communication equipment,

Under the situation of the 1st communication equipment and the 2nd communication apparatus communication, when specifying described virtual address to begin to communicate by letter, the address of the 1st communication equipment that begins described communication sign in to corresponding to described virtual address, be stored in the address of described the 1st communication equipment in the described address mapping table.

17. address mapping equipment as claimed in claim 16 is characterized in that,

With the beginning of the communication initiation command of the described virtual address of the 2nd communication equipment being judged the described communication of the 1st communication equipment.

18. address mapping equipment as claimed in claim 16 is characterized in that,

By utilizing specific predetermined port numbers, the described virtual address of the 2nd communication equipment is communicated, judge the beginning of the described communication of the 1st communication equipment.

19. as any one described address mapping equipment in the claim 16 to 18, it is characterized in that,

The address mapping table storage device is mapped the described virtual address of the address of described the 2nd communication equipment and the 2nd communication equipment, the information source port numbers address, that can distinguish a plurality of communications of described the 1st communication equipment that is added to the 1st communication equipment and stores,

Under the situation of the 1st communication equipment and the 2nd communication apparatus communication, when specifying described virtual address to begin to communicate by letter, the address of the 1st communication equipment of the described communication of beginning sign in to corresponding to described virtual address, be stored in the address of described the 1st communication equipment in the described address mapping table storage device, and the information source port numbers of described communication sign in to corresponding to described virtual address, be stored in the described information source port numbers in the described address mapping table storage device.

20. an address mapping equipment, the 1st communication equipment that communicates when the address of utilize observing the 1st agreement uses when communicating with the 2nd communication equipment that is endowed the address of observing the 2nd agreement, and this address mapping equipment has:

The address mapping table memory cell, be used for the memory address map table, in this table with the address of described the 1st communication equipment of information source, according to the described mapping address decision described virtual address that the unit distributed, be mapped with the address of the 2nd agreement of observing the 2nd communication equipment and carry out record;

The address mapping unit, the described address mapping table of being stored according to described address mapping table memory cell be the communication scaling to described virtual address of observing the 1st agreement the communication in accordance with the address of the 2nd agreement to the 2nd communication equipment;

Described address mapping table storage device is the described virtual address of the address of described the 2nd communication equipment, the 2nd communication equipment, the information source port numbers address, that can distinguish a plurality of communications of described the 1st communication equipment that is added to described the 1st communication equipment is mapped and stores

The 1st communication equipment is when specifying described virtual address to begin to communicate by letter, the conversion mailing address is to carry out the communication with the address of described virtual address described the 2nd communication equipment consistent with information source port numbers in being included in the communicating by letter of the 1st communication equipment, that described address mapping table storage device is stored.

21. a communication equipment communicates between a plurality of communication networks of different address systems, this communication equipment has:

A plurality of address conversion devices, when communicating between described a plurality of communication networks, each address conversion device just carries out the address mapping between different address systems;

Filter, to each communication unit, filter is determined the actual address mapping unit that carries out address mapping from described a plurality of address mappings unit,

22. communication equipment as claimed in claim 21, it is characterized in that, described filter is controlled the address mapping unit that makes the described address mapping unit that is determined become unique receiver address mapping request, map addresses is carried out in this request of address mapping cell response that receives this request, will return according to the resulting address of its result.

23. communication equipment as claimed in claim 21, it is characterized in that, described filter is controlled and is made the described address mapping unit that is determined become unique receiver address mapping address notified converter unit, receive this address notified converter unit and respond this notice, entry address mapping, making with this address is that the signal of destination address can be received.

24. communication equipment as claimed in claim 21, it is characterized in that, described filter is controlled and is made the described address mapping unit that is determined become unique receiver address mapping address notified converter unit, the filter that receives this address notified converter unit extracts corresponding address from this notice, making with this address is that the signal of destination address can be received.

25. as any one described communication equipment in the claim 21 to 24, it is characterized in that, it also comprises the communicator that the processing load condition to each address conversion device communicates, according to the load treatment situation of resulting each address conversion device of communication by described communication equipment, described filter is controlled the apportionment ratio of the address conversion processing of each communication.

26. communication equipment as claimed in claim 21 is characterized in that, this communication equipment has a plurality of described filters,

Each described filter determines the address mapping unit that carries out address mapping from described a plurality of address mappings unit.

27. a communication means is used for communicating between a plurality of communication networks of different address systems, this communication means has:

Entry stage, the combination of logining the terminal address of the application program identification of the terminal address of the 1st communication network or regulation and the 2nd communication network,

The address mapping stage, according to the content that this entry stage is logined, carry out address mapping,

28. communication means as claimed in claim 27 is characterized in that, it also comprises allocated phase, for the address of the address system of another communication network, distributes virtual address according to the address system of a communication network,

In described entry stage, the terminal address corresponding to the application program identification of the terminal address of a communication network of this virtual address or regulation and another communication network combined login.

29. as claim 27 or 28 described communication meanss, it is characterized in that, in described entry stage,, be when this communication beginning, to carry out with reference to the communication data that this terminal sent to the login of the application program identification of the terminal address of a communication network or regulation.

30., it is characterized in that as any one described communication means in the claim 27 to 29, at described address mapping in the stage, when between described a plurality of communication networks, communicating, use a plurality of address mappings unit to carry out address mapping between different address systems,

It also has filtration stage, and to each communication unit, it determines the actual address mapping unit that carries out address mapping from described a plurality of address mappings unit.

31. communication means as claimed in claim 30 is characterized in that, also comprises stage of communication, it communicates the processing load condition of each address converter unit,

In described filtration stage,, the apportionment ratio of the address conversion processing of each communication is controlled according to processing load condition by resulting each the address converter unit of the communication of described stage of communication.

32. a mapping schemes uses when utilizing when communicating by letter between address the 1st communication equipment that communicates and the 2nd communication equipment of giving the address of observing the 2nd agreement of observing the 1st agreement, this mapping schemes has:

The mapping address deciding step for each address of the 1st communication equipment, to described the 2nd communication equipment, is distributed the virtual address of observing the 1st agreement;

The address mapping table storing step, the address of described the 1st communication equipment of information source, the described mapping address decision described virtual address that the unit distributed, the address of observing the 2nd agreement of the 2nd communication equipment be mapped to record in the address mapping table;

The Data Receiving step, the communication to the described virtual address of described the 1st communication equipment of receive observing the 1st agreement;

The address mapping step is according to described address mapping table, to communication scaling described virtual address, that observe the 1st agreement be the communication in accordance with the address of the 2nd agreement to the 2nd communication equipment;

Data sending step sends to the 2nd communication equipment to the communication of the 1st communication equipment of described address mapping unit institute conversion, in this mapping schemes,

In described address mapping table storing step, from distribute the described virtual address of the 2nd communication equipment in described mapping address deciding step, till the 1st communication equipment uses the described virtual address of the 2nd communication equipment and the 2nd communication equipment to communicate, the address corresponding to described the 1st communication equipment of the described virtual address of the 2nd communication equipment is stored as reserved state.

33. mapping schemes as claimed in claim 32 is characterized in that,

From distributing the described virtual address of the 2nd communication equipment, till the 1st communication equipment used the described virtual address of the 2nd communication equipment and the 2nd communication equipment to communicate, described virtual address was not used in the new distribution of the 2nd communication equipment.

34. mapping schemes as claimed in claim 33 is characterized in that,

Within a certain period of time, when when the 1st communication equipment can not carry out the communication of the described virtual address of the 2nd communication equipment, described virtual address can be used for the new distribution of the 2nd communication equipment after the described virtual address of having distributed the 2nd communication equipment.

35. as any one described mapping schemes in the claim 32 to 34, it is characterized in that,

According to the address mapping table storing step, the described virtual address of the address of described the 2nd communication equipment, the 2nd communication equipment, the information source port numbers that is added in the communication address, described the 1st communication equipment of the 1st communication equipment be mapped be stored in the address mapping table

When having distributed the described virtual address of the 2nd communication equipment, the information source port numbers of carrying out request for allocation communication is logined in described information source port numbers corresponding with described virtual address, that described address mapping table storage device is stored.

36. a mapping schemes, the 1st communication equipment that communicates when the address of utilize observing the 1st agreement uses when communicating with the 2nd communication equipment that is endowed the address of observing the 2nd agreement, and this mapping schemes has:

The address mapping table storing step, the address of described the 1st communication equipment of information source, the described mapping address decision described virtual address that the unit distributed, the address of observing the 2nd agreement of the 2nd communication equipment be mapped to be stored in the address mapping table;

Under the situation of the 1st communication equipment and the 2nd communication apparatus communication, when specifying described virtual address to begin to communicate by letter, the address of the 1st communication equipment that begins described communication sign in to corresponding to described virtual address, be stored in the address of the communication equipment in the described address mapping table.

37. mapping schemes as claimed in claim 36 is characterized in that,

38. mapping schemes as claimed in claim 36 is characterized in that,

By utilizing specific predetermined end slogan, the described virtual address of the 2nd communication equipment is communicated, judge the beginning of the described communication of the 1st communication equipment.

39. as any one described mapping schemes in the claim 36 to 38, it is characterized in that,

Be saved in the storage list of address mapping table after the described virtual address of the address of described the 2nd communication equipment, the 2nd communication equipment, the information source port numbers address, that can distinguish a plurality of communications of described the 1st communication equipment that is added to the 1st communication equipment be mapped,

Under the situation of the 1st communication equipment to the 2nd communication apparatus communication, when specifying described virtual address to begin to communicate by letter, the address of the 1st communication equipment of the described communication of beginning is signed in in the address corresponding to the communication equipment in the address mapping table described virtual address, described, and the information source port numbers of described communication is signed in in the described information source port numbers of being stored corresponding to address mapping table storage device described virtual address, described.

40. a mapping schemes, the 1st communication equipment that communicates when the address of utilize observing the 1st agreement uses when communicating with the 2nd communication equipment that is endowed the address of observing the 2nd agreement, and this mapping schemes comprises:

The address mapping table storing step, the address of observing the 2nd agreement of the address of described the 1st communication equipment of information source, the described mapping address decision described virtual address that the unit distributed, the 2nd communication equipment is mapped to be stored in the address mapping table;

The described virtual address of the address of described the 2nd communication equipment, the 2nd communication equipment, the information source port numbers address, that can distinguish a plurality of communications of described the 1st communication equipment of adding the 1st communication equipment to be mapped to be stored in the address mapping table,

The 1st communication equipment is when specifying described virtual address to begin to communicate by letter, and the conversion mailing address is to carry out consistent with described virtual address and to communicate with the address that is included in described the 2nd communication equipment information source port numbers unanimity in the 1st communication apparatus communication, that described address mapping table storage device is stored.

41. a communication means is used for communicating having between a plurality of communication networks of different address systems, this communication means comprises,

When between described a plurality of communication networks, communicating, use a plurality of address mappings unit to carry out address mapping between different address systems,

Have filtration stage,, from described a plurality of address mappings unit, determine the actual address mapping unit that carries out address mapping each communication unit,

42. communication means as claimed in claim 41 is characterized in that,

Also comprise stage of communication, it communicates the processing load condition of each address converter unit,